Lock box



FIG. 1 is a perspective view of a lock box showing my new design;

FIG. 2 is a front elevation view;

FIG. 3 is a left-side elevation view, the right-side elevation view is the mirror image thereof;

FIG. 4 is a bottom elevation view;

FIG. 5 is a top elevation view; and,

FIG. 6 is a back elevation view. 

I claim the ornamental design for a lock box, as shown and described. 